If you want to modulate several parameters with one midi CC just inside modular, there are plenty ways of doing this ! Especially thanks to BCmodular : its modules have modulation inputs and with ranger modules, you can have one fader that control several parameters thru rangers and rangers allow you to accentuate / invert / expand / diminuate / log / exp modulation signals.

BCmodular switchs allow you to control several switchs with only one knob or fader. You can also wire several modulation input from several BCmodular modules together with one of them wired to a fader and this fader modulates all those modules. This is the BCmodular particularity a single value generator, such as a fader or knob, mays control several modulable parameters ! And almost all BCmodules parameters has an input and can be modulated from outside.
For instance, if you want to modulate several SC eq module frequency, you just can do this with midi CC, so you will need Spacef CC. But if you use BCmodular eq modules, you can do this with a single fader and as much as you want eq modules.
Just take care to one strange thing : BCmodular faders have timing issues / jitter and SC fader don't. I spoke to Sharc about that and he told me he was going to check why.

Or indeed, use a Spacef CC2/CC5/ ... outside modular but this solution is more DSP hungry with much less resolution.